these 3 derivations will be built:
  /nix/store/gm6myh2akz3142yynmnpm8n3hcsmly5j-nixos-vm.drv
  /nix/store/8c4lf4dw7mhvk2h6aks3q2gn4wcclx0s-nixos-test-driver-pgmq.drv
  /nix/store/nxm2v4qq3mghvvzmcfkp349cjh63v1b1-vm-test-run-pgmq.drv